The summer of 2026 was exceptionally warm, sunny, and dry compared to historical norms. The season recorded a mean air temperature of 23.4 degrees Celsius, which is 3.3 degrees above the 20-year average of 20.1 degrees and 5.1 degrees above the all-time seasonal average of 18.3 degrees. The warmest day reached 39.7 degrees Celsius on July 30, matching the highest temperature recorded in both the 20-year and all-time records for this season. The coldest day was 9.4 degrees Celsius on June 6, notably milder than the 20-year minimum of 3.7 degrees and the all-time minimum of 1.1 degrees.

Precipitation totaled only 83.1 millimeters, a stark contrast to the 20-year seasonal average of 5488.1 millimeters and the all-time total of 11723.9 millimeters. The wettest day brought just 16.3 millimeters on August 21, which did not exceed the 30-millimeter threshold typically used to flag extreme daily rainfall. Average humidity was 54.0 percent, well below the 20-year average of 68.0 percent and the all-time average of 71.9 percent. Cloud cover averaged 46.6 percent, lower than the 20-year figure of 58.1 percent and the all-time figure of 57.7 percent. Mean global radiation was 266.7 watts per square meter, higher than the 20-year average of 236.5 and the all-time average of 225.2. Sunshine duration averaged 576.7 minutes, exceeding the 20-year average of 456.3 minutes and the all-time average of 431.7 minutes.

The season produced 78 summer days, 52 hot days, and 12 tropical nights. All three counts are above the 20-year seasonal averages, which correspond to roughly 54.7 summer days, 18.75 hot days, and 2.75 tropical nights per season when divided across the 20-year period. The 52 hot days are particularly striking, as they represent a substantial increase over the 20-year per-season average and approach the all-time seasonal record implied by the total of 1559 hot days across all years. No frost days or ice days were recorded, which is consistent with both historical periods for summer.